分析了 1 986年以来三门峡水库运用水位的变化、龙门至潼关河段与潼关至大坝河段冲淤变化及其对潼关高程的影响。结果表明 ,龙门至潼关河段的冲淤受来水来沙的影响 ,为沿程淤积 ;潼关至大坝河段冲淤主要与入库的水沙条件、水库的运用有关。潼关高程受上下游河段冲淤的影响 ,且其变化趋势与上下游河段累积冲淤量线升降趋势一致 The change of water level of Sanmenxia reservoir since 1986, the erosion and deposition variation from Longmen to Tongguan reach and from Tongguan to Dam and its influence on the elevation of Tongguan were analyzed. The results show that the scouring and silting from Longmen to Tongguan reach affected by incoming water and sediment and silted along the route. The scour and silting in Tongguan-Dam section are mainly related to the conditions of water and sediment storage and reservoir utilization. The Tongguan elevation is affected by the scouring and silting of the upstream and downstream reach, and its trend of change is in line with the trend of increase and decrease of the cumulative scouring and silting lines in the upstream and downstream reach